There's nothing you can do about it now - it's too late.
The time to do this was when the ticket was returnable, three years ago.
There's a legal saying. He who sits on his hands gets nothing
I am an attorney admitted solely in NY. None of the answers I submit on this forum constitutes legal advice, even to questioners in NY, and no attorney-client relationship is hereby created.
Unless you own a trucking company, the safest thing to do when you get a NYC parking ticket is pay it. Especially if it is only $50.00. It's the added price you have to pay to live in NYC - which is why I don't live in the city!